Chiral NHC‐Catalyzed [4+2] Cycloadditions: Highly Diastereo/Enantioselective Access to Spiro[cyclohex‐4‐ene‐1,3′‐indoles] and DFT Calculations
作者:Xiaoyu Chen、Siqi Xia、Xiaoru Hu、Guofu Zhong、Limin Yang
DOI:10.1002/chem.202203818
日期:——
A highly efficient NHC-catalyzed cycloaddition of a wide range of (E)-alkenylisatins and γ-chloroenals has been developed to provide spirocyclohexeneoxindole derivatives in good yield with excellent diastereo- and enantioselectivities (up to >20 : 1 d.r., >99 % ee) under mild conditions without the use of metal and additives. Based on computational investigations, the role of the NHC on the diastereo-
已开发出一种高效的 NHC 催化的各种 (E)-链烯基化丁和 γ-氯烯醛的环加成反应,以提供高产率的螺环己烯并吲哚衍生物,具有出色的非对映和对映选择性(高达 >20 : 1 dr,> 99 % ee ) 在不使用金属和添加剂的温和条件下。基于计算研究,讨论了 NHC 对非对映和对映选择性的作用。